Enhanced energy storage properties of Ba0.85Ca0.15Zr0.1Ti0.9O3—8%BiFeO3 ceramics by doping of Mg ions and Ti ions

Energy storage ceramics are important materials used in dielectric energy storage capacitors, which have a large dielectric constant, low dielectric loss, and good temperature stability. It has a promising application in high temperature-resistant dielectric pulse power systems. This study uses the sol–gel method to prepare Ba0.85Ca0.15Zr0.1Ti0.9O3 (abbreviated as BCZT) precursor powder, and then uses the solid phase method to prepare Ba0.85Ca0.15Zr0.1Ti0.9O3-8%BiFe1-x(Mg0.5Ti0.5)xO3 (abbreviated as BCZT-BFMT, x = 0, 15, 50 and 100%). The effects of different doping amounts of Mg ions and Ti ions on the energy storage performance of BCZT-BFMT ceramics were systematically investigated. The results show that all samples with different compositions show pure phase and dense microstructures, and the sample with x = 50% has better dielectric properties. When the doping content is 50%, the energy storage density of the sample is 0.73 J/cm3 under the breakdown electric field of 108 kV/cm, which is significantly improved compared with the pure BCZT-BF sample.